James Pan

原题网址：https://leetcode.com/problems/verify-preorder-sequence-in-binary-search-tree/Given an array of numbers, verify whether it is the correct preorder traversal sequence of a binary search tree.

原题网址：https://leetcode.com/problems/find-k-pairs-with-smallest-sums/You are given two integer arrays nums1 and nums2 sorted in ascending order and an integer k.Define a pair (u,v) which consists

原题网址：https://leetcode.com/problems/best-time-to-buy-and-sell-stock-iv/Say you have an array for which the ith element is the price of a given stock on day i.Design an algorithm to find the m

原题网址：https://leetcode.com/problems/count-of-smaller-numbers-after-self/You are given an integer array nums and you have to return a new counts array. The counts array has the property where coun

原题网址：https://leetcode.com/problems/remove-duplicate-letters/Given a string which contains only lowercase letters, remove duplicate letters so that every letter appear once and only once. You mus

原题网址：https://leetcode.com/problems/russian-doll-envelopes/You have a number of envelopes with widths and heights given as a pair of integers (w, h). One envelope can fit into another if and on

原题网址：http://www.lintcode.com/en/problem/backpack-iii/Given n kind of items with size Ai and value Vi(each item has an infinite number available) and a backpack with size m. What's the maximum

原题网址：http://www.lintcode.com/en/problem/backpack-ii/Given n items with size Ai and value Vi, and a backpack with size m. What's the maximum value can you put into the backpack? Notice

原题网址：http://www.lintcode.com/en/problem/backpack/Given n items with size Ai, an integer m denotes the size of a backpack. How full you can fill this backpack? NoticeYou can not divid

原题网址：https://leetcode.com/problems/alien-dictionary/There is a new alien language which uses the latin alphabet. However, the order among letters are unknown to you. You receive a list of words

原题网址：https://leetcode.com/problems/the-skyline-problem/A city's skyline is the outer contour of the silhouette formed by all the buildings in that city when viewed from a distance. Now suppose y

原题网址：https://leetcode.com/problems/coin-change/You are given coins of different denominations and a total amount of money amount. Write a function to compute the fewest number of coins that you

原题网址：https://leetcode.com/problems/maximal-square/Given a 2D binary matrix filled with 0's and 1's, find the largest square containing all 1's and return its area.For example, given the foll

原题网址：https://leetcode.com/problems/create-maximum-number/Given two arrays of length m and n with digits 0-9 representing two numbers. Create the maximum number of length k  from digits of th

原题网址：https://leetcode.com/problems/burst-balloons/Given n balloons, indexed from 0 to n-1. Each balloon is painted with a number on it represented by array nums. You are asked to burst all t

原题网址：https://leetcode.com/problems/count-of-range-sum/Given an integer array nums, return the number of range sums that lie in [lower, upper] inclusive.Range sum S(i, j) is defined as the su

原题网址：https://leetcode.com/problems/arithmetic-slices-ii-subsequence/A sequence of numbers is called arithmetic if it consists of at least three elements and if the difference between any two con